Form grinder



June 20, 1950 c. .1. H. BUTLER FORM GRINDER 3 Sheets-Sheet 1 Filed Aug. 30,- 1947 ArryS Filed Aug. 50, 1947 3 Sheets-Sheet 3 u 20, 1950 c. J. H. Bum? 2,51 ,3 3

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Patented June 20, 1950 FORM GRINDER Clifford John Harold Butler, Cottonville, South Australia, Australia Application August 30, 1947, Serial No. 771,468 In Australia September 2, 1946' 4- Claims.

This invention relates to an improved form grinder and particularly it relates to a grinder for scissor, shear and knife blades and the like which is adapted to grind in conformance with a preselected former. a It is the object of this invention to provide a form grinder which has means whereby the memher to be ground may be moved past the grinding wheel or cylinder in conformance with a preselected former. It is a further object of this invention to provide-means whereby the grinding wheel face may be formed by means of a cutter to suitably shape it to grind the member to be ground for a required preselected former. It is a still further object of this invention to provide means whereby the grinding heads may be angularly displaced with respect to the member to be ground when required.

In the present type of form grinders a base is provided upon which a transverse adjustable slide supports a box type bed and main longitudinal table, the said longitudinal table oscillating horizontally in a longitudinal direction. The displacement of the oscillation is controlled by means of hydraulic stop valves, the said valves being operated from stops on the longitudinal oscillating table. The displacement of the said longitudinal table may be varied at will by means of adjustment of the said stops. The grinding heads are normally secured to the said base and have means whereby the grinding heads may be adjusted with respect to the oscillating longitudinal table. By moving the grinding heads longitudinally and altering the angular displacement, blades can be ground either on the left hand or right hand faces of the grinding wheels instead of having two machines: one for left hand grinding and one for right hand grinding,

According to this invention however a further auxiliary oscillating longitudinal table is provided which is oscillated in the longitudinal direction by means of the main longitudinal table but which has means whereby it may move in a transverse direction across the main longitudinal table. The operation of the auxiliary table is controlled by means of a former or formers, the said formers controlling the movement of the auxiliary table in a transverse direction across the main longitudinal table. The auxiliary table is provided with rollers which co-operate with the former or formers and has spring loading between the rollers and the former so that when the main table is oscillating in a longitudinal direction the transverse movement of the auxiliary table will be in accordance with the former or formers by 2 which it is operated. Means are also provided whereby the grinding heads may be adjusted with respect to the operating tables and also may be adjusted so that the angle of the grinding head with respect to the longitudinal tables may be varied. The member to be ground is secured to the auxiliary table so that in operation the movement of the member to be ground will be in conformance with the former provided. The former or formers used may be varied as required for the member to be ground.

In order however that the invention may be more clearly understood it will now be described with reference to the accompanying drawings in which:

- Fig. l is a front elevation of the machine,

. i Fig. 2 is a plan view of Fig. 1,

Fig. 3 is a partial-plan View of the machine in which the auxiliary table has been removed to show the operating portions upon the main oscillating table,

Fig. 4 is a sectional end view illustrating the rollers and spring means between the main oscillating table and the auxiliary table, and

Fig. 5 is a plan view of the underside of the auxiliary table.

The base I of the machine is adapted to support a further frame 3 upon which is slidably mounted the main longitudinal oscillating table 2. The main oscillating table 2 is slidable upon guides carried by the frame A hand wheel 6 is provided which may be operated to provide the lateral movement of the frame 3 and therefore .of the-table 2 with respect to the frame I. The oscillating table 2 has its longitudinal movement controlled by means of reversing stops 5 carried upon the table so that by operation of the control handles 4 carried by the frame 3 in conjunction with stops 5 upon the oscillating table 2 the displacements of the oscillating table 2 may be varied as required so that when the stop 5 contacts the control handle 4 the table 2 will be reversed to give an oscillating movement. The control handles 4 are also arranged so that the table may be stopped and started at any required position.

Carried also upon the base I is a platform It! supporting the rotary grinders I which are rotated by means of motors 9. The motors 9 are adjustably carriedupon the platform Ill by means of guides l2 so that adjustment of the rotary grinding wheels 1 with respect to the table 2 may be made when required. The motors 9 are slidably carried upon guides l4 and have hand wheels F6 so that by operation of the hand wheels it the rotary grinding wheels I may be moved or adjusted in the lateral direction. Housings it are provided for the rotary grinding wheels I which will cover the upper part of the wheels.

The auxiliary table 20 is slidable in a lateral direction upon the oscillating table 2 but it moves in the longitudinal direction with the main oscillating table 2. Referring to Fig. 3 in which the auxiliary table 20 has been removed from the main oscillating table 2 it will be seen that the auxiliary table 20 is slidable upon the flat portions 22 of the table 2 in the lateral direction and is moved with the main oscillating table 2 by means of the pin 24. The pin 24 is carried between a transverse block 26 and the auxiliary table 2!], the block 26 being movable in the lateral direction within the guides 21. Referring to Fig. it will be seen that the underside of the auxiliary table 20 is shaped so that the flat portions 28 may be slidable upon the fiat portions 22 of the oscillating table 7. and the pin 24 is adapted to fit within an aperture 29 in the slidable block 26. This arrangement of the block 26 will allow the auxiliary table 2!! to move in the longitudinal direction with the oscillating table 2, but the auxiliary table may also move in the lateral direction due to the sliding action of the block 26 in the guides 21.

The underside of the auxiliary table 20 is shaped so that at its forward edge it has a downwardly projecting flange 32 which is adapted to fit over a roller 33 which is carried upon an upwardly projecting bearing member 34 which is held within the frame 3 of the machine. Referring to Fig. 4 the auxiliary table 20 is shown resting upon the oscillating table 2 which in turn is supported by the frame 3 which frame 3 supports a slidable block 36 which is slidable within guides '3! and is spring loaded by means of the spring 38. The spring 38 is carried between the strap 40 and the frame 3 and has an adjusting bolt 4| having a head 42' so that the pressure applied by the spring may be varied. The strap 40 is secured to the end of the slidable block 36 so that by further tensioning the spring 38 pressure may be applied by the spring between the frame 3 and the slidable block 35. Carried upon the slidable block 38 are upwardly projecting bearing members 43 each of which carries a roller 44 adapted to contact the recessed portion 45 on the underside of the auxiliary table 20.

The auxiliary table 20 is recessed at 48 and shaped so that it will accommodate a specially shaped former 5B which may be adiustably secured thereto by suitable screwed means. The former 5B is adapted to make contact with the roller 33 and it will be seen that the action of the spring 38 will be transferred through the block 35 to the rollers 44 so that spring tension is applied between the former 50 and the roller 33 which tension will tend to hold the former 50 in position on the roller 33 so that its movement past the roller 33 will be controlled by the longitudinal surface of the former 50.

The auxiliary table 29 is therefore moved in the longitudinal direction by the movement of the oscillating table 2 through the pin 24 but its movement in. the lateral direction is supplied by means of the shaped surface of the former 50 co-operating with the roller 33 which is actually secured to the frame 3 of the machine and which causes the lateral movement of the auxiliary table 20 in conformance with the shape of the former 50.

The recessed portion 48 in the au iliary table 20 is so arranged that the former can be easily placed and secured in the recessed portion and. various formers can be placed within the recess which is easily accessible from the top of the machine.

The auxiliary table 20 has a slot 53 in which; slidable members can be placed for positioning any suitable type of chuck upon the table 2B. The slot allows longitudinal adjustment of the chuck which is preferably of a segmental magnetic type and which ensures ease in placing the member to be ground upon the chuck.

Referring to Figs. 1 and 2 two chucks 54 are shown positioned upon the slot 53 and are of the segmental magnetic type. The member to be ground can be placed upon the surface of the magnetic chucks which are operated by means of switches 56.

Formed integrally with the chucks 54 are holders 58 which are arranged to hold a diamond cutter which is adapted to form the shape of the grinding wheels prior to the grinding operation. The diamond cutter is placed within the holder in the chuck and the correct formers are positioned within the oscillating member 20 so that when the oscillating table 2 is operated the diamond cutters will move past the rotary grinding wheels I and their movement in the lateral direction will be controlled by the formers so that the surface of the rotary grinding wheels I will be suitably prepared to conform with the particular former used in the grinding operation.

In grinding with this type of machine it is only necessary to place the member to be ground upon the magnetic chuck to adjust the lateral position of the chuck with respect to the grinding wheels I to operate the operating handles 4 so that the tables lland 23 will move with respect to the grinding wheels I and correctly grind the member to be ground to the required shape.

The method of obtaining the later-a1 move ment with respect to the rotary grinding means has been described with the formers carried by the auxiliary table 20.

It will also be appreciated that although two formers have been used that one or a series of formers would give the required efiect.

What I claim is:

1. In form grinders of the type in which a table oscillates with respect to rotary grinding means improvements characterised by; a frame supporting said oscillating table, an auxiliary table slidable upon said oscillating table, shaped former means carried by said auxiliary table, rollers carried b said frame and adapted to contact said former means, further roller means adapted to contact said auxiliary table, spring loaded slides upon said frame to carry said further roller means to maintain contact between the first said rollers and said former means, transverse guides in said oscillating table, a slidable block carried in said transverse guides, a coupling pin between said sliding block and said auxiliary table so that said auxiliary table will oscillate longitudinally with said oscillating table but will be slidable laterally by means of said transverse guides in accordance with the shape of said former means.

2. In form grinders of the type in which a table oscillates with respect to rotary grinding means improvements characterised by; a frame supporting said oscillating table, means to move said frame with respect to said rotary grinding means, an auxiliary table slidable upon said oscillating table, shaped former means carried by said auxiliary table, rollers carried, by said frame and adapted to contact said former means, further rollers adapted to roll on a longitudinal surface on said auxiliary table, spring loaded slides upon said frame carrying said further rollers to maintain contact between said first rollers and said former means, a transverse guide in said oscillating table, a slidable block carried in said transverse guide, a coupling pin carried by said auxiliary table and adapted to contact an aperture in said slidable block so that said auxiliary table is oscillated longitudinally by said pin from said oscillating table but is moved laterally during this movement by the movement of said roller upon the shaped surface of said former means.

3. In form grinders of the type in which a table oscillates with respect to rotary grinding means improvements characterised by; a frame supporting said oscillating table, an auxiliary table slidable upon said oscillating table, a pair of shaped formers spaced apart and carried by said auxiliary table, a pair of rollers carried by said frame and adapted to contact said formers, a pair of further rollers contacting a surface on said auxiliary table, slides upon said frame carrying said further rollers, means to urge said slides to cause said formers to maintain contact with the first said rollers, a transverse guide in said oscillating table, a slidable block carried in said transverse guide, a coupling pin between said slidable block and said auxiliary table so that said auxiliary table will oscillate longitudinally with said oscillating table but will be moved laterally in accordance with said pair of formers.

4. In form grinders of the type in which a table oscillates with respect to rotary grinding means improvements characterised by; an auxiliary table slidable upon said oscillating table, slots: in said auxiliary table to accommodate shapedi formers, means to detachably secure said formers; to said auxiliary table, rollers carried by the frame: of the machine and adapted to contact said form-- ers, further rollers carried by spring loaded slides: upon said frame, a recessed surface on the under-- side of said auxiliary table and adapted to contact said further rollers so that said formers are spring loaded to said first mentioned rollers, atransverse guide in said oscillating table, a slidable block in said guide, an aperture in said block, a pin carried by said auxiliary table and adapted to fit within said aperture so that said auxiliary table will oscillate longitudinally with said oscillating table but will move laterally in accordance with said formers.

CLIFFORD JOHN HAROLD BUTLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 974,523 Roberts Nov. 1, 1910 999,601 Virdin Aug. 1, 1911 1,320,462 Fowler Nov. 4, 1919 1,395,145 Robbins Oct. 25, 1921 2,187,690 Martin Jan. 16, 1940 2,379,037 Rosen June 26, 1945 2,390,521 De Vlieg Dec. 11, 1945 2,433,027 Casella Dec. 23, 1947 

